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Proof step 27 from proof rightshift-8-02 (previous step)

# int2bytes(i) = 1, i < 0 ⊦ i >> 8 = bytes2int((i2b(~1) ' + int2bytes(i)).butlast)

User applied rule insert rewrite lemma

And obtained the following new goals

Proof step 28:
⊦ ~(2 ^ (abs(j) - 1)) ≤ i ∧ i < 0 → i >> j = ~1
Proof step 29:
¬(~(2 ^ (abs(8) - 1)) ≤ i ∧ i < 0), # int2bytes(i) = 1, i < 0 ⊦ i >> 8 = bytes2int((i2b(~1) ' + int2bytes(i)).butlast)
Proof step 58:
~(2 ^ (abs(8) - 1)) ≤ i ∧ i < 0, # int2bytes(i) = 1, i < 0 ⊦ ~1 = bytes2int((i2b(~1) ' + int2bytes(i)).butlast)

Rule argument

seq: ⊦ ~(2 ^ (abs(j) - 1)) ≤ i ∧ i < 0 → i >> j = ~1 subst: [j, i] → [8, i] rotate: F spec: intops inst: name: shiftright-neg-mone

Additional information

Used terms: 8, i